TC and ABS service soon light on

Hi All,
After replacing my battery, I got the service ABS and Steering messages.
ABS and TC light are both on and no response from the TC button.
Checking for codes, I got 2 new ones:
ABS C1255 - EBCM internal Malfunction
RSS C1738 - Exhaust solenoid valve short to GND

Other code is the P1860 regarding the TCC solenoid which was on before the battery replacement.

Re: TC and ABS service soon light on

Disconnect both battery cables and tough them together. That'll discharge all the capacitors and do a sort of reboot so to speak. I wouldn't hold my breath, but it can't hurt. If the codes return, then the problems are real.

Re: TC and ABS service soon light on

Originally Posted by ghia61

What is the examine? At-list, I am ready to try....

The EBTCM is located at the bottom front left hand corner of the powertrain cradle. Access is obtained by removing the bottom air control panel under the grille, condenser/radiator OR removing the LF fender liner.

The EBTCM contains a pump motor and there is ground wire that exits the side of the motor housing and connects to a chassis ground location on the cradle. That ground wire is known to corrode/oxidize/rust and even simply break. Before you do anything else, inspect that ground wire for cleanliness and security.

Re: TC and ABS service soon light on

Exhaust solenoid - Our cars have an Automatic Level Control which controls rear ride height in response to extra weight in the trunk or rear seat. The system uses height sensors, air bladders on the shock absorbers, air lines and a compressor assembly. The system is NOT "air ride". The compressor uses a supply/vent valve controlled by a solenoid in the compressor head.

To test the system turn the key ON. After about 6 - 8 seconds you should hear the compressor run briefly - in the RR wheelwell area. OK ? Now pop the trunk and you and 2 assistants sit on the open lip. The compressor should run again to level the rear - the extra weight thing. OK ?? Now you all hop off and you listen for escaping air in the RR wheelwell as the system again levels the rear. OK ??

If this test does not work you'll need to do an ELC system diagnosis and possible overhaul. It's all in the Cadillac Tech Tips. For parts and pricing talk to Chris in parts at Rippy Cadillac over there >>>>>>>, business hours EDT.

Re: TC and ABS service soon light on

Can you please direct me to find the Tech Tip regarding the ELC system diagnosis? I can't find it (link will be great).

I found today that 2 fuses was damaged.
One is 15A for the "Export LGT", and the other one is the 30A "ELC"...
I change both of them, and after 1-2 min the 30A "ELC" fuse damaged again. The messages are still there, even before fuse burn.

Re: TC and ABS service soon light on

If the rear sags and will not stay level with extra loads in the trunk or back seat, car up on 4 jackstands or on a lift. Spray bottle of soapy water, do the compressor prove-out. Spray soap water on the air lines, shock bladders and connections - just like finding a tire leak - bubbles locate the leak.

The compressor assembly has a dessicant filter/dryer that absorbs moisture from heat of compression - the exhaust valve blows down that dessicant canister to dry it out......... but eventually it overloads with moisture and corrosive snot which ruins the solenoid head and compressor cylinder.

If the 30A ELC fuse is blowing then the compressor is seized. Replacement of the assembly is the only repair. Look at the Suncore site for rebuilt assemblies for your car, year, model. or, talk to Chris in parts at Rippy Cadillac, over there >>>>>>>. (GMT -4........ 6 hours for you)

OK - we have a problem - I noticed by your English text usage that you were probably not in the U.S. - You are in Israel. This complicates your repair problem. Look in www.rockauto.com for the compressor for your car, year, model. RockAuto ships overseas.

Please use the My Profile and Settings tabs - upper right - to update your profile with your approximate location - it sure helps with diagnosis and recommendations.

Re: TC and ABS service soon light on

Originally Posted by Submariner409

Please use the My Profile and Settings tabs - upper right - to update your profile with your approximate location - it sure helps with diagnosis and recommendations.

Done. Thanks Submariner.
You are right, I am locating in Israel and I am apologize about my English. I have some more questions.
Do I need to overhaul the compressor? What does it mean "the compressor assembly"?
What is the blowing LGT fuse?
Does the compressor problem can cause to the ABS problem?